I think I sent a wheez-O-gram on this earlier, forgive me if it is
redundant....
If you Re-bore, you will definitely need a new set of pistons ( and of
course rings.) The cost of the machine work- build the holding fixture,
bore the liners, properly finish the wall surface, etc.. is simply not
cheaper than buying a set of liners as part of a kit. When the kits are
made, the fixturing costs are negligible, as they are making them by the
boxful, and the cost is spread out over the whole run... To say nothing of
the learning curve for the machinist. He's learning with YOUR parts. I do
not think you will actually be saving any serious money, just taking some
extra risks and bother to keep the old liners. With a new set, you can
increase the bore from 83 to 87 mm, which you would have to pay extra for in
a re-bore situation. ( The machinist cannot take off that much in a single
pass with his borer, and most of them charge according to the number of
passes they have to make to reach your diameter...) Perhaps you could
make arrangements to take delivery of a piston/liner Stateside, there is
probably some legal way to avoid the duties... ( as 'used' parts?)
Good luck!
Bob Westerdale
'59 3A TS36967E
'67 Index 845 Vertical mill
'73 Southbend Heavy 10 Lathe
'56 Clausing 8520 Vertical mill etc...
Jim Wrote->
I am torn between getting the sleeves from my 3a engine bored, or getting
new
ones - the dilemma is financial otherwise the decision would be simple.
I am told that locally at least, it would be difficult to find someone to
bore
them because they are used to depending on entire blocks for stability when
boring i.e. the cylinder must hold still to assure a good job, and the
weight
of the entire block helps. A set of new sleeves however becomes a mighty
expensive
proposition by the time they land on my doorstep here in Canada.
So the question becomes: is it the experience of list members that there are
indeed machine shops around (North America) who can cope with sleeves, and
is
it cost-effective to get them done?
It is very easy to say "just get new ones". If it turns out that there
really
is a difference of say < $100 I will go with new sleeves, but, this is money
that could be put toward new pistons, rings, main bearings, tappets, big end
bearings, thrust washers, head gasket, small end bearings, camshaft
bushings,
valve guides, exhaust valves.....or who knows? There could even be something
else to spend money on.
Maybe I should have taken up quilting as a hobby.
Jim
http://www.superaje.com/home
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